Sony BD Players will not display album art

I am running Serviio 2.4 64-bit on a Win 10 Pro desktop PC connected to my wired home LAN. I am only serving audio files: MP3, FLAC, DSF. All files have embedded artwork and an artwork file named "folder.jpg".

I have two Sony disc players: BDP-S5100 (HD) and UBP-X700 (4K). They are both connected to my wired LAN.
The Sony players will not display album art. Tags are properly shown. I called Sony tech support but that was an exercise in futility.

My Oppo 103 and 203 and Denon 6200 avr (all connected to the wired LAN) all display album art so it's a Sony problem.

Is there a solution for the Sony players?

[atc98092]

Nothing from the Serviio side of the equation. The player has sole control over what (if any) metadata is available for a media file. Serviio (nor any other server) can force the player to display something it's not programmed for.

Understood. I was hoping there was something I was not setting up correctly or some command line option in Serviio or some router port that needed to be opened. I thought Sony was one of the originators of DLNA. Sony can't even fully implement the basics.

[atc98092]

Over the years Sony has gotten worse with their DLNA support. I had an older BD player that would stream all my HD ripped movies complete with the lossless audio bitstream. The last one I bought (many years ago now) would bitstream TrueHD but not DTS-MA. I could never get a clear response from Sony why they dropped the support. Since then I've used either Roku players (which don't bitstream the lossless audio either) or mostly the Nvidia Shield. It's been my go-to player for about five years now, and still plays everything I have, including my ripped UHD Blu Ray movies.